Improvement in harrows



UNITED STATES WILLIAM RENN YSON, OF NORRISTOWN, PENNSYLVANIA.

IMPROVEMENT IN HARROWS.

Specification forming part of Letters Patent No. 118,973, datedSeptember 12, 1871.

To all whom it may concern:

Be it known that 1, WILLIAM RENNYsoN, of Norristown, in the county ofMontgomery and in the State of Pennsylvania, have invented certain newand useful Improvements in Itotary Harrows; and do hereby declare thatthe following is afull, clear, and exact description thereof, referencebeing had to the accompanying drawing and to the letters of referencemarked thereon making a part of this specification.

The nature of my invention consists in the construction and arrangementof a rotary harrow, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in whicl'1Figure 1 is a plan view, and Fig. 2 a side view of my harrow.

A represents an iron hub, of suitable dimensions, in which is inserted aseries of arms, B B, radiating from the center at equal distances apart.Through these arms pass the harrowteeth 0 (J, which are secured in anydesired man ner. On the upper sides of the arms B B, near their outerends, is let in an iron circle, D, which answers the double purpose ofstrengthening and bracing the arms, and also forms a track for theroller E, which is mounted upon the rear end of the pulling-beam Gr. Atthe point where the beam G passes over the central hub A said beam isenlarged sidewise, so as to admit of three holes, a, b, and d, beingmade in the same, and a bolt passes through one of said holes and thecenter of the hub A. The hole a is directly in the center, so that thecenter of the wheel or roller E, this hole a, and the front end of thepulling-beam, will be on a straight line. The other holes b and d areone upon each side, so as to be out of the straight line mentioned.

When the horses are attached to the front end of the pulling-beam G itwill raise this end up, causing the wheel E to press down upon thecircle D, and, consequently, the teeth directly under the same will beforced down deeper into the ground than the others, thus causing arotation of the harrow, if the beam is pivoted through one of the sideholes I) and d but if the beam is pivoted in the center hole a then theharrow will drag along without rotating. The same efi'ect maybe producedby means of two side arms extending from the pulling-beam, one on eachside, from near the point where the same is pivoted, and changing thewheel or roller from the center beam to either one of the side beams. Inthis case the pulling-beam is always pivoted in the same place, theprinciple being to change the point at which the wheel presses away froma straight line drawn through the front end of the pulling-beam and thepivot-point, whether said change is effected by moving the beam itselfor only the wheel.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

In combination with a rotary harrow composed of the hub A, arms B, teeth0, and circle I), the draftbeam Gr provided with pivot holes a b (I, andwheel E, substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this15th day of July,

H. S. CARSON. (84.)

